Mold injection head



MOLD INJECTION HEAD Filed April 25, 1946 ATTORNEY.

Patented Jan. 11, 1949 UNITE D,STATE 'MOLD INJECTION"HEAD Benjamin Schwartz and Eugene H. Schwaftz,-

, Brooklyn, N. Y.

' 'Application April 25,1946,SerialNo.664,804

This invention relates generally to a new type of mold injection head orextrusion head,

A primary object of the present invention is to provide an injection head that Will simultaneously inject a plurality of colors into a mold for forming a design, pictured article or product.

Another object is to provide an injection head for fiooding a, mold simultaneously with a plurality of fusible colored materials or meta1 or alloys without allowingsuchmaterials to become fused or mixed.

Another object is to provide an injection head adapted to inject simultaneously into a mold a plurality of separate quantities of different col- .ored plastic material, or quantities of difierent colored molten glass Or quantities of metal or alloys cf meta1s.

A specific object is to provide an injection head adapted to inject simultaneously into a mold a different plurality of quantities of plastic materials having difierent primary colors together and a plurality of quantities of such materials having difierent secondary colors, the secondary colored materials being formed or mixedwhiieentente -through the injection head to the mold.

Another specific object is to provide an injection head adapted to inject simultaneously into a mold a plurality of quantities of molten glass having diiferent primary colors and a plurality of quantities of such material having different secondary colors, the secondary colored materials being formed or mixed while enroute through the injection head to the mold.

Another specific object is to provide an injectien head adapted to inject simultaneously into a mold a plurality of quantities of difierent metals or alloys and quantities of mixed metals and althat is simple in construction, inexpensive to manufacture and easily cleaned.

Other objects and advantages of the invention "will be apparent from the description thereof to follow taken in connection with the accompanying drawing in which y n 12 Claims. (Cl. s' so i Fig. lfli s a;lon gitudinal sectional view of an injection head embodying the presentinvention taken onthe planeuf the line AA of Fig. 2. Fig. 2 is an end view of the abparatus shown .inFig. 1. 7

Fig. 3 is a fragmentary detail sectional view of a modified fo1m of reservoir.

Fig. 4 is a, cross-sectional view. on an enlarged scale, alongythe plane of the line cc of Fig. 1.

Fig. 5 is a crosssectidnal view, on an enlarged scale, through the branch openings.

Fig. 6 is a sectional detai1 view of one of the nozzles.

Fig. 7 is a sectional detail view on an enlarged scale through one ,of thebranch openings. The improved apparatus comprises. a cylindrical casting l having an annular fiange 2 to -WhiCh is fastened in any suitable manner a hollow extensionshell. 3. A number of reservoirs or hoppers 4, 5 and '6 are suitably supported on top of the castingl.

The casting is formed with a number of radially spaced channels or passages l, 8 and 9 extending therethrough and each passage may be provided with a liner ID formed of suitable lining mate- ,rial. The interior oie. ach reservoir is tapered at its bottom to facilitate flow of the material and each reservoir communicates with a separate channel in the casting, by means of an opening leading from the.interior of the reservoir through the casting wa ll andliner into the channel.

, For example, reservoir 5 communicates with channel iby means of such an opening Il. Reservoir 4 communicates with channel 8 and reservoir 6 communicates With channel 9 through similar openings l l.

Each reservoir contains a supply of fusible materiai, such asfiplastic material, for example, having a primary color difierent from the color of the material in the other reservoirs. For example, reservoir 4 mayhave material colored bine, reserVoir 5 materialcclored red and reservoir 6 ma- ,teial coloredyellow. The material may flow out of the reservoirs and through the openings H into the channels by gravity or it may be forced out under pressure.

Mountedin the hollow shell 3 is a cylinder l2 and formed in the base 3' of said shell 3 are a number of passages l3 communicating with the channels l, 8 and 9 which passages may have liners similar to those of the channels.

The cylinder I2 is formed with a number of radially spacecl passages I4, I5 and i6 which communicate with the channels l, -8 and 9, respectively, through.the passages I3 in the base witn telesccpctubular bodies'33aand 330, eah

of the extension 3. These passages M, 15 and 15 extend through the cyiinder and are smailer in diameter than the channels l, 8 and 9, respectively, the wails of the passages [3 in the shell extension 3 being tapered to register with such passages in the cylinder.

Another series of radialiy disposed secondary channeis or openings I1, [8 and) are formed in the cylinder [2 and disposed' between;the,passages M, iand-IG. These channeisdo-notextend through the cylinder i2 from end to end but end at a point remote from the inner end thereof. A similar channal or opening*2fl.is disposed in the center or axially of the cylinde r and extends inwardiy of the cylinder.to aareaterdstance than the channels I1, [8 and I9. A branch opening 21 extends betwecn passage Main cylinder 12 and the secondary passage I! and .a similar branch opening.22 extends between passage [5 and said secondary passage 11. A similar "branch op ening 2-3 -exten*ds *betweenthe passage idandth-esecandary passage I3 and asiniilar branch opening=24betweenhe-passage [B and said secondarypassage l 8. Passage l 5 communicates with secondary passage [9 through branch =opening 25 and passage 14 communicates With said secor1dary passage F9through abranch openwiththe-central passage' o by-means of branch openings 21, 28 and 29,-respectively. A one-way check valve 39 is interpbSed in each ofsaidbranch openings; Sucha valveis shownin Fig. 4 consisting of a bail member 39 held in c1osed position against its seat by aspring 303:. The bal! is adaptedto 'be '*displaced by fiow of material but thedirectionofflow cannot=be*revexsed as the =baii wiikprevent this.

' The outer end "0f the cyfindr is recessed to receivea screw*threaded head member 31. This head-member is formed with a number of radiaiiy disposed spaced passages 32 extending therethrough-and equaiin nun1ber tothenurflber of passages in the cylinder i2 and disposed direct1y indinewthand communicating with said latter passages at the innenend of said passages 32. (In the-enter end of eahgosaidpassages 3Zis an adjustabl* nozzle -33.

In Fig. 6,=suha-nczzleis shown as formed provided with a spherichead and with a helical spring 32cinterposedbctwn sa'id he.ds. The spherical heads-andspfing enable the nozzle to adjust itself and ensure good contact With the ring lezkage, 7

Annuiar heating elements 34 and 35are positioned in the-cylinder l2 atound thepassages 'therein and other heating elements 36 are ra- 4 accompfished by electricaily operated devices or by chemical substances.

The mixing means is shown in Fig. 7 and consists of a shaft 38a having Vanes 3812 at one end and a pulley (net shown) at the other end connected to any suitable source of power for tuming it. A stufing box device s mounted in the conduit and comprises the usual nut 3811 and '-shoulders 38gon the shaft for-reguiating the flow of material in the conduit.

' Each of the passages 14 to (9, inclusive, in the cyfindermay be provided with a lateral opening 4l.for insertion of a pressure or temperature instrument (mot shown) 'Each of the channels l, 8 and 9 may also be providedwith a shut-ofi' valve 42 and a comp1zessed air iniet 43 for shutting off the supply of material from the reservcirs and for blowing airthrough the injection head for cleaning the *same; v

In Fig. 3 an =annuiar heating element 44 is 'sihown aroundthe outer wail 'Of' a reservcir 5 and thehefltenelement-fls surrounded by inslatiflg inaterl 45.

In operticn;the material such as plastic material in the*reservors =having the diiferent pri- -inary colors passes-downwardlyinto the respec- *tive channeis "1, -=8 and-9 --where such material is' omptessed *by -the -s1idable plungers 31 and liquefied, if not already liquid, and forCed outtafdiy through said channels into the communi- -ating passages M, l5*and l6;respective1y. The "material"contained -in the reservair 5 wil1 pass into and through channel -'l, passage 14 and out through theaiigned passage 32 in the head 3! and through the nozzie 33 ofsaid passage 32. Similar1y the=material in reservoir-4 Will pass *downwardlinto and through channeP8, passages l5' and 32and through the nozzle in passage 32; an'd Similafly thematerilinreservoin 6 will pass "d0Wh intandthrough*thechanncl 9 and passages l6 and 32170 and through the nozzle in the -passage32.

Part of--the=material with the primary color, "for instance -red; from reservoir "5 that passes through:paageld isf0rced through the branch opening or passage 2l and through the valve 30 chemin into the secondary cc lor*passage H; and similarly the colo1edmaterial that passes from Teservoir {4, fordnstance-bluc. through passage 15 -isbianhed off through-branch opening 22 into the same passage l1 *wherebya secondary color isproducedaridthismateriai with the secondary color iorced o1'1twardly-through the passage 32inheheaQd 3l and'thmugh its nozzle33.

In the =Same way, the material from reservoir 4 is branched off from passage l5 through branch cpenihg23 an d itsvalve-=30"into the secondary passage-18; and iikewise thematerial with the "primary 7 Color such as yellow from reservoir 6 '=that passes thr0ugh channeb9 and= passage lB is =branch ed oi iiito said passage [8 by means '01 mer so that they maybereg1flad "to feed the the branch opeing zd whereby materia1 With a necessary amountoimatcrial tofillthe mold.

Extending laterally throughppenings in the cylinder i2 are a nun1berofcombined*mixingand fiovr reguiatingdcvices 3flgonesuch dvice being providedfor each passage in the*cylindcr and A ing through *an opening in "the cylinder and -through its respective passage and'carryin a rotatabie member in the passage-and beingsuitably formed at its enter-end as et Al! for manualcr automatic rotation. The**mbfing may' als'o ha each device comprising a stem-member 39 extendiow, rspectivly; pasS=-through *branch openings M and 25, respectively, afld *their Valves into the secor1darypassage 4 9" to produce a material with *a ksecondarylur WhiCh 'material is Torce'd "thfough said passage P9 and "aligned passage 32 and nozzle 33. The material imthe secondary passages I1, I8 and le are thoroughly mixed by the mixing devices 38.

The materials with the primary colors in the channels l, 8 and 9 also pass through the branch limes 27 into the central secondary passage 20 where they are mixed and forced outwardly through said passage 20 and its aligned passage 32 and nozzle 3.3.

The materia] passing outwardly through the nozzies 33 is injected into a mold for producing an ornamental multicolored design such as disclosed in copending application Serial Number 515,117.

We claim:

1. A mold injection head comprising a casting having a plurality of spaced channels formed therein and extending therethrough, a plurality of reservoirs supported on said casting, each of said reservoirs having an opening in its bottom, said casting having openings communicating with the openings in said reservoirs, a plunger in each of said channels, a hollow shell having a closed base at its inner end and an open outer end secured to one end of said casting and forming an extension thereof, the base of said shell having openings communicating with the channels in said casting, a cylinder within the shell having main passages extending longitudinally therethrough and communicating with the channels in the casting through the openings in the base of the shell and having secondary passages leading to the outer end of the cylinder and with branch passages connecting the main passages with the respective secondary passages and a head member in the outer end of said shell having passages extending therethrough and communicating with the passages in the cylinder.

2. A mold injection head as defined in claim 1 characterized by nozzles in the outer ends of the passages in the head member.

3. A mold injection head as defined in claim 1 characterized by valves in the branch passages in the cylinder that connect the main passages with the secondary passages.

4. A mold injection head as defined in claim 1 characterized by nozzles in the outer ends of the passages in the head member and valves in the branch passages in the cylinder that connect the main passages with the secondary passages.

5. A mold injection head as defined in claim 1 characterized by mixing and fiow regulating devices in the passages in the cylinder.

6. A mold injection head as defined in claim 1 characterized by shut-ofi valves and compressed air inlets in the channels for cleaning the injection head.

7. A mold injection head as defined in claim 1 characterized by1ateral openings in the passages in the cylinder for receiving testing tools.

8. A mold injection head as defined in claim 1 characterized by reservoirs having heating elements therearound and heat insulators around said heating elements.

9. A mold injection head as defined in claim 1 characterized by nozzles in the outer ends of the passages in the head member, valves in the branch passages in the cylinder that connect the main passages with the secondary passages, mixing and fiow regulating devices in the passages in the cylinder and shut-oi valves and compressed air inlets in the channels for cleaning the injection head.

10. A mold injection head comprising a casting having a plurality oi spaced channels formed therein and extending therethrough, a plurality cf reservoirs supported on said casting, each 01 said reservoirs having an opening in its bottom, said casting having openings communicating With the openings in. said reservoirs, a plunger in each of said channels, a hollow shell having a closed base at its inner end and an open outer end secured to one end of said casting and forming an extension thereof, the base of said shell having openings communicating with the channels in said casting, a cylinder within said shell having main passages extending longitudinally therethrough and communicating with the channels in the casting through the openings in the base of the shell and a head member in the outer end of said shell having passages extending there through and communicating With the passages in the cylinder.

11. A mold injection head as defined in claim 10 characterized by nozzles in the outer ends of the passages in the head member, flow regulating devices in the passages in the cylinder and shutoff valves and compressed air inlets in the channels for cleaning the injection head.

12. A device of the kind described comprising a casting having a plurality of spaced channels formed therein and extending therethrough, a plurality of reservoirs supported on said casting, each of said reservoirs having an opening in its bottom, said casting having openings communicating with the openings in said reservoirs, a plunger in each of said channels, a hollow shell having a closed base at its inner end and open at its outer end secured to one end of said casting and forming an extension thereof, the base of said shell having openings communicating With the channels in said casting, a cylinder within the shell having main passages extending longitudinally therethrough and communicating with the channels in the casting through the openings in the base of the shell and having secondary pas sages leading to the outer end of the cylinder, said secondary passages communicating with a plurality of main passages and a head member in the outer end of said shell having passages extending therethrough and communicating with the passages in the cy1inder.

BENJAMIN SCHWARTZ. EUGENE H. SCHWARTZ.

REFERENOES CITE!) The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,952,241 Eckert Mar. 27, 1934 2,162,563 Oldham June 13, 1939 2,203,620 Smith June 4, 1940 2,226,408 Nast Dec. 24, 1940 

